Two Rod and Valve Gear Questions

[NW Mailing List]

The boiler weight would remain the same and carried by the front and rear engines but the weight on drivers is going to change as the fuel load and water is consumed from the front & rear bunkers. Normal articulated engines have a constant weight on the drivers as the fuel & water consumed would  be taken from the tender which has no relevance to the weight on drivers or weight of the engine. The tender gets lighter but that has nothing to do with it.
I have no proof but I'm sure N&W steam designers as well as the major builderswere aware of the Garretts and other developments and considered them. The poppet valve mechanisms developed in Europe long before the limited experimentation in the US.
Roger HuberDeer Creek Locomotive Works 

    On Wednesday, August 8, 2018, 8:52:48 AM CDT, NW Mailing List <nw-mailing-list at nwhs.org> wrote:  
 
   On 8/7/2018 5:13 PM, NW Mailing List via NW-Mailing-List wrote:
 
    They were certainly interesting to watch running. So odd seeing ll that firebox just hanging out in the breeze. Not being an expert in anything I would say the engine with thee water bunker would have to lose a lot of traction as the tank was emptied. The tender with the fuel bunker would suffer the same fate. Those could be  rather bad features. Conventional articulateds wouldn't summer that problem except the Triplex and VGN engine which were not very efficient for other reasons. 
  
    
 (snip)
 
 Since the boiler weight is suspended between the two engines, would it not still have just about as much traction as a standard articulated?   Also the tender shell weight is also still on the engines rather than being drug behind. Granted full tanks and bunkers would give the best results and, since they are usually full when starting a train, I can see where that would be an advantage.    
 
 Wonder if any American loco builders or individual roads did any research or comparisons between Garretts and our standard articulated locos ??
 
 While not exactly pure N&W stuff, it is an interesting discussion. 
 
  Take care
 Bill 
 
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